696 lines
19 KiB
C
696 lines
19 KiB
C
/*
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* FreeSec: libcrypt for NetBSD
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*
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* Copyright (c) 1994 David Burren
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* All rights reserved.
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*
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* Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet
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* this file should now *only* export crypt(), in order to make
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* binaries of libcrypt exportable from the USA
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*
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* Adapted for FreeBSD-4.0 by Mark R V Murray
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* this file should now *only* export crypt_des(), in order to make
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* a module that can be optionally included in libcrypt.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of other contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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* This is an original implementation of the DES and the crypt(3) interfaces
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* by David Burren <davidb@werj.com.au>.
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*
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* An excellent reference on the underlying algorithm (and related
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* algorithms) is:
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*
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* B. Schneier, Applied Cryptography: protocols, algorithms,
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* and source code in C, John Wiley & Sons, 1994.
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*
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* Note that in that book's description of DES the lookups for the initial,
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* pbox, and final permutations are inverted (this has been brought to the
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* attention of the author). A list of errata for this book has been
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* posted to the sci.crypt newsgroup by the author and is available for FTP.
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*
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* ARCHITECTURE ASSUMPTIONS:
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* It is assumed that the 8-byte arrays passed by reference can be
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* addressed as arrays of u_int32_t's (ie. the CPU is not picky about
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* alignment).
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <pwd.h>
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#include <string.h>
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#include "crypt.h"
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/* We can't always assume gcc */
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#ifdef __GNUC__
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#define INLINE inline
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#endif
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static u_char IP[64] = {
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58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
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57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
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};
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static u_char inv_key_perm[64];
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static u_char u_key_perm[56];
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static u_char key_perm[56] = {
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57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
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10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
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63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
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14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
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};
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static u_char key_shifts[16] = {
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1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
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};
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static u_char inv_comp_perm[56];
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static u_char comp_perm[48] = {
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14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
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23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
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41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
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44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
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};
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/*
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* No E box is used, as it's replaced by some ANDs, shifts, and ORs.
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*/
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static u_char u_sbox[8][64];
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static u_char sbox[8][64] = {
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{
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14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
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0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
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4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
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15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
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},
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{
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15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
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0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
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13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
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},
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{
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10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
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13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
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13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
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1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
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},
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{
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7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
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13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
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10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
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3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
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},
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{
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2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
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14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
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4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
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11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
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},
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{
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12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
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10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
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9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
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4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
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},
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{
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4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
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13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
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1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
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6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
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},
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{
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13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
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1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
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7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
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2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
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}
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};
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static u_char un_pbox[32];
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static u_char pbox[32] = {
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16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
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2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
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};
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static u_int32_t bits32[32] =
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{
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0x80000000, 0x40000000, 0x20000000, 0x10000000,
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0x08000000, 0x04000000, 0x02000000, 0x01000000,
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0x00800000, 0x00400000, 0x00200000, 0x00100000,
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0x00080000, 0x00040000, 0x00020000, 0x00010000,
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0x00008000, 0x00004000, 0x00002000, 0x00001000,
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0x00000800, 0x00000400, 0x00000200, 0x00000100,
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0x00000080, 0x00000040, 0x00000020, 0x00000010,
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0x00000008, 0x00000004, 0x00000002, 0x00000001
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};
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static u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
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static u_int32_t saltbits;
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static long old_salt;
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static u_int32_t *bits28, *bits24;
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static u_char init_perm[64], final_perm[64];
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static u_int32_t en_keysl[16], en_keysr[16];
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static u_int32_t de_keysl[16], de_keysr[16];
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static int des_initialised = 0;
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static u_char m_sbox[4][4096];
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static u_int32_t psbox[4][256];
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static u_int32_t ip_maskl[8][256], ip_maskr[8][256];
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static u_int32_t fp_maskl[8][256], fp_maskr[8][256];
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static u_int32_t key_perm_maskl[8][128], key_perm_maskr[8][128];
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static u_int32_t comp_maskl[8][128], comp_maskr[8][128];
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static u_int32_t old_rawkey0, old_rawkey1;
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static u_char ascii64[] =
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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/* 0000000000111111111122222222223333333333444444444455555555556666 */
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/* 0123456789012345678901234567890123456789012345678901234567890123 */
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static INLINE int
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ascii_to_bin(char ch)
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{
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if (ch > 'z')
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return(0);
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if (ch >= 'a')
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return(ch - 'a' + 38);
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if (ch > 'Z')
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return(0);
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if (ch >= 'A')
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return(ch - 'A' + 12);
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if (ch > '9')
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return(0);
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if (ch >= '.')
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return(ch - '.');
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return(0);
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}
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static void
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des_init()
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{
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int i, j, b, k, inbit, obit;
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u_int32_t *p, *il, *ir, *fl, *fr;
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old_rawkey0 = old_rawkey1 = 0L;
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saltbits = 0L;
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old_salt = 0L;
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bits24 = (bits28 = bits32 + 4) + 4;
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/*
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* Invert the S-boxes, reordering the input bits.
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*/
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for (i = 0; i < 8; i++)
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for (j = 0; j < 64; j++) {
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b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf);
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u_sbox[i][j] = sbox[i][b];
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}
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/*
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* Convert the inverted S-boxes into 4 arrays of 8 bits.
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* Each will handle 12 bits of the S-box input.
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*/
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for (b = 0; b < 4; b++)
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for (i = 0; i < 64; i++)
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for (j = 0; j < 64; j++)
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m_sbox[b][(i << 6) | j] =
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(u_sbox[(b << 1)][i] << 4) |
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u_sbox[(b << 1) + 1][j];
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/*
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* Set up the initial & final permutations into a useful form, and
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* initialise the inverted key permutation.
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*/
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for (i = 0; i < 64; i++) {
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init_perm[final_perm[i] = IP[i] - 1] = i;
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inv_key_perm[i] = 255;
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}
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/*
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* Invert the key permutation and initialise the inverted key
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* compression permutation.
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*/
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for (i = 0; i < 56; i++) {
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u_key_perm[i] = key_perm[i] - 1;
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inv_key_perm[key_perm[i] - 1] = i;
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inv_comp_perm[i] = 255;
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}
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/*
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* Invert the key compression permutation.
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*/
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for (i = 0; i < 48; i++) {
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inv_comp_perm[comp_perm[i] - 1] = i;
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}
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/*
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* Set up the OR-mask arrays for the initial and final permutations,
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* and for the key initial and compression permutations.
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*/
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for (k = 0; k < 8; k++) {
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for (i = 0; i < 256; i++) {
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*(il = &ip_maskl[k][i]) = 0L;
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*(ir = &ip_maskr[k][i]) = 0L;
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*(fl = &fp_maskl[k][i]) = 0L;
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*(fr = &fp_maskr[k][i]) = 0L;
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for (j = 0; j < 8; j++) {
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inbit = 8 * k + j;
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if (i & bits8[j]) {
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if ((obit = init_perm[inbit]) < 32)
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*il |= bits32[obit];
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else
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*ir |= bits32[obit-32];
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if ((obit = final_perm[inbit]) < 32)
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*fl |= bits32[obit];
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else
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*fr |= bits32[obit - 32];
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}
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}
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}
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for (i = 0; i < 128; i++) {
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*(il = &key_perm_maskl[k][i]) = 0L;
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*(ir = &key_perm_maskr[k][i]) = 0L;
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for (j = 0; j < 7; j++) {
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inbit = 8 * k + j;
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if (i & bits8[j + 1]) {
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if ((obit = inv_key_perm[inbit]) == 255)
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continue;
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if (obit < 28)
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*il |= bits28[obit];
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else
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*ir |= bits28[obit - 28];
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}
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}
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*(il = &comp_maskl[k][i]) = 0L;
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*(ir = &comp_maskr[k][i]) = 0L;
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for (j = 0; j < 7; j++) {
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inbit = 7 * k + j;
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if (i & bits8[j + 1]) {
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if ((obit=inv_comp_perm[inbit]) == 255)
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continue;
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if (obit < 24)
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*il |= bits24[obit];
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else
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*ir |= bits24[obit - 24];
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}
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}
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}
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}
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/*
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* Invert the P-box permutation, and convert into OR-masks for
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* handling the output of the S-box arrays setup above.
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*/
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for (i = 0; i < 32; i++)
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un_pbox[pbox[i] - 1] = i;
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for (b = 0; b < 4; b++)
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for (i = 0; i < 256; i++) {
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*(p = &psbox[b][i]) = 0L;
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for (j = 0; j < 8; j++) {
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if (i & bits8[j])
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*p |= bits32[un_pbox[8 * b + j]];
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}
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}
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des_initialised = 1;
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}
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static void
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setup_salt(long salt)
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{
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u_int32_t obit, saltbit;
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int i;
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if (salt == old_salt)
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return;
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old_salt = salt;
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saltbits = 0L;
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saltbit = 1;
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obit = 0x800000;
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for (i = 0; i < 24; i++) {
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if (salt & saltbit)
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saltbits |= obit;
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saltbit <<= 1;
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obit >>= 1;
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}
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}
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static int
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des_setkey(const char *key)
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{
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u_int32_t k0, k1, rawkey0, rawkey1;
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int shifts, round;
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if (!des_initialised)
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des_init();
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rawkey0 = ntohl(*(u_int32_t *) key);
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rawkey1 = ntohl(*(u_int32_t *) (key + 4));
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if ((rawkey0 | rawkey1)
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&& rawkey0 == old_rawkey0
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&& rawkey1 == old_rawkey1) {
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/*
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* Already setup for this key.
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* This optimisation fails on a zero key (which is weak and
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* has bad parity anyway) in order to simplify the starting
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* conditions.
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*/
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return(0);
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}
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old_rawkey0 = rawkey0;
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old_rawkey1 = rawkey1;
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/*
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* Do key permutation and split into two 28-bit subkeys.
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*/
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k0 = key_perm_maskl[0][rawkey0 >> 25]
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| key_perm_maskl[1][(rawkey0 >> 17) & 0x7f]
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| key_perm_maskl[2][(rawkey0 >> 9) & 0x7f]
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| key_perm_maskl[3][(rawkey0 >> 1) & 0x7f]
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| key_perm_maskl[4][rawkey1 >> 25]
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| key_perm_maskl[5][(rawkey1 >> 17) & 0x7f]
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| key_perm_maskl[6][(rawkey1 >> 9) & 0x7f]
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| key_perm_maskl[7][(rawkey1 >> 1) & 0x7f];
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k1 = key_perm_maskr[0][rawkey0 >> 25]
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| key_perm_maskr[1][(rawkey0 >> 17) & 0x7f]
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| key_perm_maskr[2][(rawkey0 >> 9) & 0x7f]
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| key_perm_maskr[3][(rawkey0 >> 1) & 0x7f]
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| key_perm_maskr[4][rawkey1 >> 25]
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| key_perm_maskr[5][(rawkey1 >> 17) & 0x7f]
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| key_perm_maskr[6][(rawkey1 >> 9) & 0x7f]
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| key_perm_maskr[7][(rawkey1 >> 1) & 0x7f];
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/*
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* Rotate subkeys and do compression permutation.
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*/
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shifts = 0;
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for (round = 0; round < 16; round++) {
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u_int32_t t0, t1;
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shifts += key_shifts[round];
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t0 = (k0 << shifts) | (k0 >> (28 - shifts));
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t1 = (k1 << shifts) | (k1 >> (28 - shifts));
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de_keysl[15 - round] =
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en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f]
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| comp_maskl[1][(t0 >> 14) & 0x7f]
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| comp_maskl[2][(t0 >> 7) & 0x7f]
|
|
| comp_maskl[3][t0 & 0x7f]
|
|
| comp_maskl[4][(t1 >> 21) & 0x7f]
|
|
| comp_maskl[5][(t1 >> 14) & 0x7f]
|
|
| comp_maskl[6][(t1 >> 7) & 0x7f]
|
|
| comp_maskl[7][t1 & 0x7f];
|
|
|
|
de_keysr[15 - round] =
|
|
en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f]
|
|
| comp_maskr[1][(t0 >> 14) & 0x7f]
|
|
| comp_maskr[2][(t0 >> 7) & 0x7f]
|
|
| comp_maskr[3][t0 & 0x7f]
|
|
| comp_maskr[4][(t1 >> 21) & 0x7f]
|
|
| comp_maskr[5][(t1 >> 14) & 0x7f]
|
|
| comp_maskr[6][(t1 >> 7) & 0x7f]
|
|
| comp_maskr[7][t1 & 0x7f];
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
do_des( u_int32_t l_in, u_int32_t r_in, u_int32_t *l_out, u_int32_t *r_out, int count)
|
|
{
|
|
/*
|
|
* l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
|
|
*/
|
|
u_int32_t l, r, *kl, *kr, *kl1, *kr1;
|
|
u_int32_t f, r48l, r48r;
|
|
int round;
|
|
|
|
if (count == 0) {
|
|
return(1);
|
|
} else if (count > 0) {
|
|
/*
|
|
* Encrypting
|
|
*/
|
|
kl1 = en_keysl;
|
|
kr1 = en_keysr;
|
|
} else {
|
|
/*
|
|
* Decrypting
|
|
*/
|
|
count = -count;
|
|
kl1 = de_keysl;
|
|
kr1 = de_keysr;
|
|
}
|
|
|
|
/*
|
|
* Do initial permutation (IP).
|
|
*/
|
|
l = ip_maskl[0][l_in >> 24]
|
|
| ip_maskl[1][(l_in >> 16) & 0xff]
|
|
| ip_maskl[2][(l_in >> 8) & 0xff]
|
|
| ip_maskl[3][l_in & 0xff]
|
|
| ip_maskl[4][r_in >> 24]
|
|
| ip_maskl[5][(r_in >> 16) & 0xff]
|
|
| ip_maskl[6][(r_in >> 8) & 0xff]
|
|
| ip_maskl[7][r_in & 0xff];
|
|
r = ip_maskr[0][l_in >> 24]
|
|
| ip_maskr[1][(l_in >> 16) & 0xff]
|
|
| ip_maskr[2][(l_in >> 8) & 0xff]
|
|
| ip_maskr[3][l_in & 0xff]
|
|
| ip_maskr[4][r_in >> 24]
|
|
| ip_maskr[5][(r_in >> 16) & 0xff]
|
|
| ip_maskr[6][(r_in >> 8) & 0xff]
|
|
| ip_maskr[7][r_in & 0xff];
|
|
|
|
while (count--) {
|
|
/*
|
|
* Do each round.
|
|
*/
|
|
kl = kl1;
|
|
kr = kr1;
|
|
round = 16;
|
|
while (round--) {
|
|
/*
|
|
* Expand R to 48 bits (simulate the E-box).
|
|
*/
|
|
r48l = ((r & 0x00000001) << 23)
|
|
| ((r & 0xf8000000) >> 9)
|
|
| ((r & 0x1f800000) >> 11)
|
|
| ((r & 0x01f80000) >> 13)
|
|
| ((r & 0x001f8000) >> 15);
|
|
|
|
r48r = ((r & 0x0001f800) << 7)
|
|
| ((r & 0x00001f80) << 5)
|
|
| ((r & 0x000001f8) << 3)
|
|
| ((r & 0x0000001f) << 1)
|
|
| ((r & 0x80000000) >> 31);
|
|
/*
|
|
* Do salting for crypt() and friends, and
|
|
* XOR with the permuted key.
|
|
*/
|
|
f = (r48l ^ r48r) & saltbits;
|
|
r48l ^= f ^ *kl++;
|
|
r48r ^= f ^ *kr++;
|
|
/*
|
|
* Do sbox lookups (which shrink it back to 32 bits)
|
|
* and do the pbox permutation at the same time.
|
|
*/
|
|
f = psbox[0][m_sbox[0][r48l >> 12]]
|
|
| psbox[1][m_sbox[1][r48l & 0xfff]]
|
|
| psbox[2][m_sbox[2][r48r >> 12]]
|
|
| psbox[3][m_sbox[3][r48r & 0xfff]];
|
|
/*
|
|
* Now that we've permuted things, complete f().
|
|
*/
|
|
f ^= l;
|
|
l = r;
|
|
r = f;
|
|
}
|
|
r = l;
|
|
l = f;
|
|
}
|
|
/*
|
|
* Do final permutation (inverse of IP).
|
|
*/
|
|
*l_out = fp_maskl[0][l >> 24]
|
|
| fp_maskl[1][(l >> 16) & 0xff]
|
|
| fp_maskl[2][(l >> 8) & 0xff]
|
|
| fp_maskl[3][l & 0xff]
|
|
| fp_maskl[4][r >> 24]
|
|
| fp_maskl[5][(r >> 16) & 0xff]
|
|
| fp_maskl[6][(r >> 8) & 0xff]
|
|
| fp_maskl[7][r & 0xff];
|
|
*r_out = fp_maskr[0][l >> 24]
|
|
| fp_maskr[1][(l >> 16) & 0xff]
|
|
| fp_maskr[2][(l >> 8) & 0xff]
|
|
| fp_maskr[3][l & 0xff]
|
|
| fp_maskr[4][r >> 24]
|
|
| fp_maskr[5][(r >> 16) & 0xff]
|
|
| fp_maskr[6][(r >> 8) & 0xff]
|
|
| fp_maskr[7][r & 0xff];
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
des_cipher(const char *in, char *out, long salt, int count)
|
|
{
|
|
u_int32_t l_out, r_out, rawl, rawr;
|
|
int retval;
|
|
|
|
if (!des_initialised)
|
|
des_init();
|
|
|
|
setup_salt(salt);
|
|
|
|
rawl = ntohl(*((u_int32_t *) in)++);
|
|
rawr = ntohl(*((u_int32_t *) in));
|
|
|
|
retval = do_des(rawl, rawr, &l_out, &r_out, count);
|
|
|
|
*((u_int32_t *) out)++ = htonl(l_out);
|
|
*((u_int32_t *) out) = htonl(r_out);
|
|
return(retval);
|
|
}
|
|
|
|
char *
|
|
crypt_des(const char *key, const char *setting)
|
|
{
|
|
int i;
|
|
u_int32_t count, salt, l, r0, r1, keybuf[2];
|
|
u_char *p, *q;
|
|
static u_char output[21];
|
|
|
|
if (!des_initialised)
|
|
des_init();
|
|
|
|
|
|
/*
|
|
* Copy the key, shifting each character up by one bit
|
|
* and padding with zeros.
|
|
*/
|
|
q = (u_char *) keybuf;
|
|
while (q - (u_char *) keybuf - 8) {
|
|
if ((*q++ = *key << 1))
|
|
key++;
|
|
}
|
|
if (des_setkey((u_char *) keybuf))
|
|
return(NULL);
|
|
|
|
if (*setting == _PASSWORD_EFMT1) {
|
|
/*
|
|
* "new"-style:
|
|
* setting - underscore, 4 bytes of count, 4 bytes of salt
|
|
* key - unlimited characters
|
|
*/
|
|
for (i = 1, count = 0L; i < 5; i++)
|
|
count |= ascii_to_bin(setting[i]) << (i - 1) * 6;
|
|
|
|
for (i = 5, salt = 0L; i < 9; i++)
|
|
salt |= ascii_to_bin(setting[i]) << (i - 5) * 6;
|
|
|
|
while (*key) {
|
|
/*
|
|
* Encrypt the key with itself.
|
|
*/
|
|
if (des_cipher((u_char*)keybuf, (u_char*)keybuf, 0L, 1))
|
|
return(NULL);
|
|
/*
|
|
* And XOR with the next 8 characters of the key.
|
|
*/
|
|
q = (u_char *) keybuf;
|
|
while (q - (u_char *) keybuf - 8 && *key)
|
|
*q++ ^= *key++ << 1;
|
|
|
|
if (des_setkey((u_char *) keybuf))
|
|
return(NULL);
|
|
}
|
|
strncpy(output, setting, 9);
|
|
|
|
/*
|
|
* Double check that we weren't given a short setting.
|
|
* If we were, the above code will probably have created
|
|
* wierd values for count and salt, but we don't really care.
|
|
* Just make sure the output string doesn't have an extra
|
|
* NUL in it.
|
|
*/
|
|
output[9] = '\0';
|
|
p = output + strlen(output);
|
|
} else {
|
|
/*
|
|
* "old"-style:
|
|
* setting - 2 bytes of salt
|
|
* key - up to 8 characters
|
|
*/
|
|
count = 25;
|
|
|
|
salt = (ascii_to_bin(setting[1]) << 6)
|
|
| ascii_to_bin(setting[0]);
|
|
|
|
output[0] = setting[0];
|
|
/*
|
|
* If the encrypted password that the salt was extracted from
|
|
* is only 1 character long, the salt will be corrupted. We
|
|
* need to ensure that the output string doesn't have an extra
|
|
* NUL in it!
|
|
*/
|
|
output[1] = setting[1] ? setting[1] : output[0];
|
|
|
|
p = output + 2;
|
|
}
|
|
setup_salt(salt);
|
|
/*
|
|
* Do it.
|
|
*/
|
|
if (do_des(0L, 0L, &r0, &r1, count))
|
|
return(NULL);
|
|
/*
|
|
* Now encode the result...
|
|
*/
|
|
l = (r0 >> 8);
|
|
*p++ = ascii64[(l >> 18) & 0x3f];
|
|
*p++ = ascii64[(l >> 12) & 0x3f];
|
|
*p++ = ascii64[(l >> 6) & 0x3f];
|
|
*p++ = ascii64[l & 0x3f];
|
|
|
|
l = (r0 << 16) | ((r1 >> 16) & 0xffff);
|
|
*p++ = ascii64[(l >> 18) & 0x3f];
|
|
*p++ = ascii64[(l >> 12) & 0x3f];
|
|
*p++ = ascii64[(l >> 6) & 0x3f];
|
|
*p++ = ascii64[l & 0x3f];
|
|
|
|
l = r1 << 2;
|
|
*p++ = ascii64[(l >> 12) & 0x3f];
|
|
*p++ = ascii64[(l >> 6) & 0x3f];
|
|
*p++ = ascii64[l & 0x3f];
|
|
*p = 0;
|
|
|
|
return(output);
|
|
}
|